Challenges in the formability of the next generation of automotive steel sheets

2018 ◽  
Vol 34 (9) ◽  
pp. 1112-1117 ◽  
Author(s):  
H. L. Yi ◽  
L. Sun ◽  
X. C. Xiong
Keyword(s):  
Next Generation ◽  
Steel Sheets ◽  
Automotive Steel

scholarly journals Study of Solidification Cracking Susceptibility during Laser Welding in an Advanced High Strength Automotive Steel

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 673 ◽  
Author(s):  
Gautam Agarwal ◽  
He Gao ◽  
Murugaiyan Amirthalingam ◽  
Marcel Hermans
Keyword(s):  
Laser Welding ◽  
High Strength ◽  
Free Edge ◽  
Processing Parameters ◽  
Solidification Cracking ◽  
Transverse Strain ◽  
Cracking Behavior ◽  
Steel Sheets ◽  
Weld Solidification Cracking ◽  
Automotive Steel

Susceptibility to weld solidification cracking in transformation-induced plasticity steel sheets was studied using a modified standard hot cracking test used in the automotive industry. To vary the amount of self-restraint, bead-on-plate laser welding was carried out on a single-sided clamped specimen at increasing distances from the free edge. Solidification cracking was observed when welding was carried out close to the free edge. With increasing amount of restraint, the crack length showed a decreasing trend, and at a certain distance, no cracking was observed. With the aid of a finite element-based model, dynamic thermal and mechanical conditions that prevail along the transverse direction of the mushy zone are used to explain the cracking susceptibility obtained experimentally. The results indicate that the transverse strain close to the fusion boundary can be used as a criterion to predict the cracking behavior. The outcome of the study shows that optimum processing parameters can be used to weld steels closer to the free edge without solidification cracking.

scholarly journals A Study on Cosmetic and Perforation Corrosion Test for Automotive Steel Sheets

1986 ◽  
Vol 72 (8) ◽  
pp. 1111-1118 ◽  
Author(s):  
Shigeo KUROKAWA ◽  
Tenji BAN ◽  
Koji YAMATO ◽  
Toshio ICHIDA
Keyword(s):  
Corrosion Test ◽  
Steel Sheets ◽  
Automotive Steel

scholarly journals Modeling of Surface Crack Defects Developed on Shear Edge in High-strength Automotive Steel Sheets

2020 ◽  
Vol 60 (1) ◽  
pp. 143-152
Author(s):  
Sota Goto ◽  
Kazuhiko Yamazaki ◽  
Thi-Huyen Doan ◽  
Yoshimasa Funakawa ◽  
Osamu Umezawa
Keyword(s):  
Surface Crack ◽  
High Strength ◽  
Steel Sheets ◽  
Shear Edge ◽  
Automotive Steel

Inter-Relationship among Skin Pass Reduction, 3D and 2D Roughness Parameters and the Stampability/Paintability of Cold Rolled Steel Sheets for the Automotive Industry: A Preliminary Analysis

2014 ◽  
Vol 783-786 ◽  
pp. 1039-1045 ◽  
Author(s):  
Eduardo Nunes ◽  
Antonio Fabiano de Oliveira ◽  
Thiago Sekeres ◽  
Christian Wichern ◽  
Ronald Lesley Plaut
Keyword(s):  
Automotive Industry ◽  
Spectral Curve ◽  
Research Work ◽  
Roughness Parameters ◽  
Steel Sheets ◽  
Skin Pass ◽  
Cold Rolled ◽  
Automotive Steel ◽  
2D And 3D ◽  
Published Research

The aim of this research work is to study the inter-relationship, under controlled industrial conditions, among skin pass reductions, surface topography (characterized by 2D and 3D) roughness parameters, stampability and painted surface finish quality for automotive steel sheet stampings.Different surface textures obtained from cold rolling finishing have been evaluated in terms of paintability tests (rating and spectral curve) and tentatively related to roughness parameters (2D and 3D) obtained from the cold finished sheets. Some relevant tendencies have been established amongst these parameters.The results presented here are in accordance with other recently published research showing that there is a clear relationship between these parameters, and that further detailed studies are needed.

Advanced Technologies for Spot Weld Fracture Prediction in Automotive Steel Sheets

2020 ◽  
Vol 89 (6) ◽  
pp. 416-419
Author(s):  
Takahiro AITO ◽  
Koichi HAMADA ◽  
Shigeru YONEMURA ◽  
Toshiyuki NIWA
Keyword(s):  
Spot Weld ◽  
Fracture Prediction ◽  
Steel Sheets ◽  
Advanced Technologies ◽  
Automotive Steel

Influence of dynamic loading on failure behavior of spot welded automotive steel sheets

2018 ◽  
Vol 144 ◽  
pp. 407-426 ◽  
Author(s):  
Wooram Noh ◽  
Youngwoo Koh ◽  
Kwansoo Chung ◽  
Jung-Han Song ◽  
Myoung-Gyu Lee
Keyword(s):  
Dynamic Loading ◽  
Failure Behavior ◽  
Steel Sheets ◽  
Automotive Steel ◽  
Spot Welded

scholarly journals Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3379
Author(s):  
Si On Kim ◽  
Won Seog Yang ◽  
Sung Jin Kim
Keyword(s):  
Corrosion Resistance ◽  
Hot Stamping ◽  
Electrochemical Techniques ◽  
Corrosion Current ◽  
Selective Dissolution ◽  
Localized Corrosion ◽  
Steel Sheets ◽  
Corrosion Behaviors ◽  
Automotive Steel ◽  
Hot Stamping Steel

The effects of the combined addition of Zn and Mg on the corrosion resistance of AlSi-based coating for automotive steel sheets were investigated using a variety of analytical and electrochemical techniques. The preferential dissolution of Mg and Zn from MgZn2/Mg2Si phases occurred on the AlSi-based coating that had been alloyed with a smaller portion of Zn and Mg, which contributed to the rapid surface coverage by corrosion products with a protective nature, reducing the corrosion current density. On the other hand, localized corrosion attacks caused by the selective dissolution of Mg were also observed in the AlSi-based coating with a smaller portion of Zn and Mg. Such alloying can also worsen its corrosion resistance when coated additionally with electrodeposited paint. The mechanistic reasons for these conflicting results are also discussed.

Fatigue Life of Multi-Lap Welding of Automotives Steel Sheet by QSTS

2008 ◽  
Vol 33-37 ◽  
pp. 151-156
Author(s):  
Seung Chul Shin ◽  
Sung Mo Yang ◽  
Hyo Sun Yu ◽  
Hee Yong Kang ◽  
Chae Won Kim
Keyword(s):  
Life Cycle ◽  
Fatigue Life ◽  
Welded Joints ◽  
Fuel Efficiency ◽  
Life Extension ◽  
Steel Sheets ◽  
Whole Process ◽  
Lap Welding ◽  
Automotive Steel ◽  
Spot Welded

This paper shows how the number of lap of spot welded joints in automotive steel sheets changes the life -cycle transform of itself. There has been significant developments in the life extension of automotive steel sheets, as well as in passenger safety. We verified the validity of the S-N curve of materials by QSTS test. Moreover, we used EZNCEN and HS40R, which are commonly used as automotive steel sheets because of their excellence in increasing fuel efficiency. The purpose of research was to compare the fatigue life of multi - lap of spot welded joints to there. In addition s, we used the two different kinds of sheets together in the same welding under the same condition. Through this whole process, the hypothesis on the life cycle of lethargy coefficients was found to be in good agreement with the result of the experiment. That is, when using sheets of the same materials in one welding, the fatigue life of two laps of a spot welded joint was found to be much superior by EZNCEN 5~14%, HS40R 17~30%,and when using each sheet of different materials, we found the decrease in fatigue life by 6~16%. Finally, the best value from the data was chosen based on the experiment for the analysis of the fatigue life of each layer.

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